The GNRH1 Knockout NCI-H1703 Polyclonal Cells comprise a CRISPR/Cas9-edited population of human lung squamous cell carcinoma cells with disruption of the GNRH1 locus. This polyclonal knockout model eliminates gonadotropin-releasing hormone (GnRH) expression, enabling investigation of autocrine/paracrine GnRH signaling in malignant lung epithelium. The heterogeneous editing across the polyclonal pool avoids clonal biases and provides a robust loss-of-function system for functional studies.
The parental NCI-H1703 cell line was established from a lung squamous cell carcinoma of a 54-year-old male smoker. It represents a widely used model of non-small cell lung cancer (NSCLC) with characteristic molecular features, including p53 mutation. This epithelial line is suitable for studying signaling pathways that drive squamous carcinoma progression. By engineering a GNRH1 knockout in these cells, researchers can explore neuroendocrine-like signaling within a squamous cancer context.
GNRH1 encodes GnRH, which canonically regulates reproduction by stimulating pituitary LH and FSH secretion via GNRHR. In non-pituitary tissues, GnRH signaling activates Gq/11-mediated PLC, generating IP3 and DAG to mobilize calcium and PKC, subsequently engaging the MAPK/ERK cascade and transcription factors such as FOS, JUN, and EGR1. Key upstream regulators include kisspeptin (KISS1) and neurokinin B, while downstream effectors include gonadotropin subunits LHB and FSHB. Interaction partners like beta-arrestin and calmodulin modulate receptor desensitization. Knockout of GNRH1 disrupts this entire pathway, silencing GnRH-mediated activation of GNRHR and downstream MAPK and calcium pathways, which may impact cell proliferation and survival in NCI-H1703 cells.
In the lung cancer context, GNRH1 knockout allows interrogation of GnRH/GNRHR autocrine signaling, which has been implicated in tumor cell growth and migration. This model is particularly valuable for studying neuroendocrine-like features in squamous carcinoma, as well as for testing GnRH analogs that may exert anti-proliferative effects. The polyclonal nature preserves population heterogeneity, enhancing physiological relevance. Researchers can dissect GNRH1-dependent phenotypes such as cell cycle progression, apoptosis resistance, and signal transduction changes.
Applications include functional genomics screens, calcium imaging, proliferation and invasion assays, and gene expression analysis by RT-qPCR and western blotting for phospho-ERK. This knockout model is also suited for evaluating therapeutic strategies targeting GnRH signaling in lung cancer. For further details, please contact Ascent Research.
